Heat and Thermodynamics - PowerPoint PPT Presentation

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Heat and Thermodynamics

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Heat and Thermodynamics Rachel Sandman Kristen Schlotman Kiara Sierra Physics, period 6 Temperature Temperature tells how hot or cold something is. – PowerPoint PPT presentation

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Title: Heat and Thermodynamics


1
Heat and Thermodynamics
  • Rachel Sandman
  • Kristen Schlotman
  • Kiara Sierra
  • Physics, period 6

2
Temperature
  • Temperature tells how hot or cold something is.
  • Three scales Celsius, Fahrenheit, and Kelvin.

3
Heat and Internal Energy
  • Heat always flows from higher temperature
    substances to lower temperature substances.

4
Measurement of Heat
  • The units for heat are the calorie and the
    kilocalorie (1000 calories).

5
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6
Specific Heat Capacity
  • Different substances have different capacities
    for storing internal energy.

7
Thermal Expansion
  • An increase in heat causes an expansion of the
    substance.
  • An example is a thermostats bimetallic strip.

8
Conduction
  • Heat is transferred through objects by
    conduction.
  • Metals are the best conductors.

9
Insulation
  • Insulators delay the transfer of heat.
  • Liquids and gases in general are good insulators.

10
Convection
  • Through convection, heating occurs by currents in
    a fluid.

11
Radiation
  • The suns heat is transmitted through radiation.
  • Energy transmitted by radiation is called radiant
    energy.

12
Newtons Law of Cooling
  • The rate of cooling of an object is approximately
    proportional to the temperature difference
    between the object and its surroundings.

13
Phase Changes
  • Evaporation (liquid to gas)
  • Condensation (gas to liquid)
  • Boiling (liquid to gas)
  • Freezing (liquid to solid)

14
First Law of Thermodynamics
  • Whenever heat is added to a system, it transforms
    to an equal amount of some other form of energy.

15
Second Law of Thermodynamics
  • Heat will never of itself flow from a cold object
    to a hot object.

16
Entropy
  • Entropy is the measure of the amount of disorder.
  • As disorder increases, entropy increases.
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